Question about 2007 GMC Sierra 1500

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Right front and rear turn signal isnt working. also the signal light on the dash doesnt light up but the left signals work. the bulbs seem ok.

It seems that after I replaced the bulbs for the break lights that's when the right signal light doesn't work.

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Check fuses, I think they now have seperate fuses. I know I ran into this before on something else.

Posted on Apr 20, 2015

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1993 del Sol Si 1.6L right F & R turn signals won't blink - front lights up and bulbs good - brake/backup lights fine - no relay under dash, bought one still nothing, left side both work


If the rear turn signal lights are out, and the front lights are ok but don't blink then, the bad bulbs in the rear turn signals should need to be replaced.
Or there could be a bad ground connection.
Also, there may be two relays for front and back lights.
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Left bleaker and break light not working. Turn signal works bleaks faster than right side.


Has the vehicle been in an accident on the left rear side. First check the bulb to be sure it is not defective, trade it out with the side that works properly to test. If the bulb works well then My thought are you may have a shorted wire. The turn signal flasher works by heat build up within the flasher the heat is caused by the load of the bulbs, the load heats the metal spring causing it to open the circuit then as quickly as it cools down the circuit closes again lighting the bulbs.
There is also a possibility of a defect in the turn signal mechanism on the steering column. The turn signal switch on many models does three different things on many models that use the same bulb element / or bulb for brake and turn on rear of vehicle. It controls the circuit for brake light by sending power both left and right side rear when turn signal is in neutral position then when turn signal is in left turn the switch cancels brake light power to left side rear and supplies flasher power to left side while maintaining brake light supply to the right side rear, and so on opposite when the right turn is chosen on turn signal switch. The turn signal indicators on the dash normally run off the same circuit as front turn signal bulb only which is also controlled by turn signal switch. Front has turn signals but no brake light.
I think there is an additional load on the left side rear turn circuit and it could be either a wire that is shorted or the turn signal switch if the same bulb element is used for both functions.
Often times if trailer lighting is connected the flasher will also blink a little faster because of the extra load of additional bulbs.

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was the correct bulb used? this sounds like a single function bulb was used NOT the bulb that will light with the headlights and ALso produce turn singles

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have you checked the bulbs front and back. to see if they work, bulb check. then it sounds like you might have a bad signal flasher that only works the left side and not the right side. or if a bulb at the front or the rear gets bright but not the opposite bulb on the same side then you may just have a bad bulb or socket or power to the socket when doing the bulb check.

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no that light wouldnt have nothing to do with it. did you take the bulb out and visually inspect it?? or just go by the brake light working?? either bulb is bad, or short in the wire going to the socket

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Signal Lights - flasher...


Hi it sounds like the multifuntion switch
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